Chock



FIG. 1 is a upper and left side perspective view of a chock showing our new design;

FIG. 2 is side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

CLAIM The ornamental design for a chock, as shown and described. 